CVE-2020-5415 json
Concourse's GitLab auth allows impersonation
published 2020-08-12 6 y ago modified 2026-09-08 2 mo ago also BIT-concourse-2020-5415 , EUVD-2021-2453 , GHSA-627p-rr78-99rj
- cvss
- 10.0
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
Concourse, versions prior to 6.3.1 and 6.4.1, in installations which use the GitLab auth connector, is vulnerable to identity spoofing by way of configuring a GitLab account with the same full name as another user who is granted access to a Concourse team. GitLab groups do not have this vulnerability, so GitLab users may be moved into groups which are then configured in the Concourse team.
Patch / fix
- go github.com/concourse/concourse 0.0.0-20200730151558-b00d1c8d8576, 1.6.1-0.20200730151558-b00d1c8d8576, 6.3.1, 6.4.1
- go github.com/concourse/dex 0.0.0-20200730150203-821b48abfd88, 6.3.1, 6.4.1
- bitnami concourse 6.3.1, 6.4.1
- VMware Tanzu Concourse 6.3.1, 6.4.1
Exploit prediction
1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 10.0 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
| OSV | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/concourse/concourse | >=6.4.0, <6.4.1 >=1.6.1, <6.3.1 <0.0.0-20200730151558-b00d1c8d8576 >=0.0.0, <1.6.1-0.20200730151558-b00d1c8d8576 |
6.4.1 6.3.1 0.0.0-20200730151558-b00d1c8d8576 1.6.1-0.20200730151558-b00d1c8d8576 |
| go | github.com/concourse/dex | >=6.4.0, <6.4.1 >=0.0.0, <6.3.1 <0.0.0-20200730150203-821b48abfd88 |
6.4.1 6.3.1 0.0.0-20200730150203-821b48abfd88 |
| bitnami | concourse | <6.3.1 >=6.4.0, <6.4.1 |
6.3.1 6.4.1 |
Affected products
- VMware Tanzu Concourse
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
github.com
/concourse/concourse/security/advisories/GHSA-627p-rr78-99rj
web, patch, third-party-advisory, advisory
-
tanzu.vmware.com
/security/cve-2020-5415
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-5415
advisory, web
Sources
- CVE List CVE-2020-5415
- GitHub Advisory GHSA-627p-rr78-99rj
- NVD CVE-2020-5415
- OSV BIT-concourse-2020-5415
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.